I found the pictures of folks rolling the fold-up kayak. I made an 8' model out of a scrap of campaign sign to see how it works. It is interesting. It might even be big enough for my 10-year-old to paddle around in. I haven't put it into the water yet, but just from moving it around it seems a lot sturdier than I expected.
Hey there, that's an awesome idea. I'd like to try making an 8 footer as well. Would you happen to still have your design plans or rough dimensions for it? Do I need to do anything special to make the folds on corrugated plastic? I'm guessing I can't just cut one surface like the way normal folds are done since that might make it leak.